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TI-2021-16614 Aliases CVE-2021-39229GHSA-qhmp-h54x-38qr

Regular expression deinal of service in apprise

Priority LOW 37CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

Apprise is an open source library which allows you to send a notification to almost all of the most popular notification services available. In affected versions users who use Apprise granting them access to the IFTTT plugin (which just comes out of the box) are subject to a denial of service attack on an inefficient regular expression. The vulnerable regular expression is [here](https://github.com/caronc/apprise/blob/0007eade20934ddef0aba38b8f1aad980cfff253/apprise/plugins/NotifyIFTTT.py#L356-L359). The problem has been patched in release version 0.9.5.1. Users who are unable to upgrade are advised to remove `apprise/plugins/NotifyIFTTT.py` to eliminate the service.

Why it matters now

EPSS 0.01891 79th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed apprise (caronc): 0.9.5.1apprise (PyPI): 0.9.5.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
caroncapprisebefore 0.9.5.10.9.5.1Patch availableCNA
—apprise (PyPI)before 0.9.5.10.9.5.1Patch availableGHSA-qhmp-h54x-38qr
  • apprise Vendorcaronc Affected before 0.9.5.1 Fixed in 0.9.5.1 Patch available CNA
  • apprise (PyPI) Vendor— Affected before 0.9.5.1 Fixed in 0.9.5.1 Patch available GHSA-qhmp-h54x-38qr

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nuxref:apprise:*:*:*:*:*:*:*:*before 0.9.5.1VulnerableNuxref
  • cpe:2.3:a:nuxref:apprise:*:*:*:*:*:*:*:* Versions before 0.9.5.1 Vulnerable ·Nuxref

Remediation

  • Fix · CNA apprise (caronc) Fixed in 0.9.5.1
  • Fix · GHSA-qhmp-h54x-38qr apprise (PyPI) Fixed in 0.9.5.1 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-39229
  2. 2026-10-03 Alias added: GHSA-qhmp-h54x-38qr

References

Exploit 1

Patch 1

Advisory 2

Other 4

  • TI-2026-42332 Apprise forwards configured auth headers across cross-origin HTTP redirects CVSS 3.1LOW 3.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences